PLATE 3 



EXPLANATION OF FIGURES 



28 Three cells from the germinal epithelium (the free surface is up). 'cV is 

 a definitive oocyte in stage 'a' ('protobroque'?), while the others are undifferenti- 

 ated epithelial cells. Mouse eleven da3's p.p. P.A.F., I.H. 



29 Germinal epithelium, 'd' is a definitive oocyte in stage 'a'; 'e' and 'f 

 are oocytes in stage 'b'; 'g' is an ordinary epithelial cell, and 'h' is a cell of the 

 tunica albuginea. Same ovary as figure 28. 



30 to 33 Stage 'b'. 30 and 33 are from the same ovary as figure 28; 31 is from 

 a mouse twelve days p.p., Herm., I.H. and 32 is from a mouse twelve days p.p., 

 FL, Tri. 



34 Transition, 'b' to 'c'. Same ovary as figure 28. 



35 Transition, 'b' to 'c'. The germinal epithelium has been torn away from 

 the ovary, probably through shrinkage, carrying with it a developing oocyte. 

 Same ovary as figure 28. 



36 Definitive oocyte, stage 'c'. Early stage of follicle formation. The 

 free surface of the epithelium is up. Mouse ten days p.p., FL, I.H. 



310 



